<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style>
		body{
			background: red url() 0 0 no-repeat;
		}
		.box{
			width: 200px;
			height: 200px;
			background: rgba(35,180,35,0.5) url() 0 0 no-repeat;
		}
	</style>
</head>
<body>
	<div class="box"></div>
</body>
</html>